For each set of lines, say whether they are parallel or not parallel.

a. These three lines appear to be equidistant from each other and extend in the same direction without converging or diverging.

• Answer: $\boxed{\text{Parallel}}$

b. These two lines are not the same distance apart along their length. If extended, they would eventually intersect.

• Answer: $\boxed{\text{Not parallel}}$

c. These two lines appear to be equidistant from each other and extend in the same direction without converging or diverging.

• Answer: $\boxed{\text{Parallel}}$

d. These two lines clearly intersect at a point.

• Answer: $\boxed{\text{Not parallel}}$